Each antibody binds to a specific antigen; an interaction similar to a lock and key. An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shape protein produced by plasma cells that is used by the immune system to identify and neutralize pathogens such as bacteria and viruses.The antibody recognizes a unique molecule of the harmful agent, called an antigen, via the variable region.he membrane-bound form of an antibody may be called a surface immunoglobulin (sIg) or a membrane immunoglobulin (mIg). It is part of the B cell receptor (BCR), which allows a B cell to detect when a specific antigen is present in the body and triggers B cell activation.
The Beginnings Slavery in America began in 1619, meaning that was when slaves began to show up in the original colonies. However, this practice had happened even in the Spanish colonies as early as the 1560s. What has to be remembered is that slaves weren't always the way we think of them.
The Thirteenth Amendment. Slavery is Americaâs original sin. Despite the bold commitment to equality in the Declaration of Independence, slavery was legal in all of the thirteen colonies in 1776. By the start of the Civil War, four million people, nearly all of African descent, were held as slaves in 15 southern and border states.